Who will be the 59th American President?

That's more than 50 years away, assuming each president serves only one term. I'm no better at predictions than anyone, but that long is more than a lifetime away for me.

I would not know that, since we are only on #45.

Beelzebub?  Or perhaps some other liberal?                                                                     

No one knows.

Trump is the 45th (or 44th if you are counting people instead of "presidencies").

We won't see the 59th for several decades yet.

In fact: likely no one now alive will see the 59th.